Optical observation of subband structures in a-Si : H/a-SiNx : H superlattices by wavelength modulated absorption

✍ Scribed by X.N. Liu; L.R. Niu; D. Shau

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 103 KB
• Volume: 13
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1993.1042

✦ Synopsis

By using wavelength modulated absorption (WMA), optical transitions between subbands are revealed in (\mathrm{a}-\mathrm{Si}: \mathrm{H} / \mathrm{a}-\mathrm{SiN}{\mathrm{x}}: \mathrm{H}) superlattices for the well-layer thicknesses less than (50 \AA). The threshold energies of the distinct step-like features in WMA spectra coincide with the predictions of a one-dimensional quantum well model, provided that the effective mass is adjusted from (0.23 \mathrm{mo}) to (0.30 \mathrm{mo}{\mathrm{o}}) as the welllayer thickness decreases to (13 \AA).